Crosslinking kinetics of the formation of lignin‐aminated polyol‐based polyurethane foam

Huo, Shuping; Nie, Min; Kong, Zhenwu; Wu, Guomin; Chen, Jian

doi:10.1002/app.35401

Cited by 40 publications

(32 citation statements)

References 15 publications

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“…The single use of unmodified or modified castor oil as a polyol is already consolidated [3,21]. Modified lignins have also been studied for this application [22,23]. However, the combination of modified castor oil (MCO) and unmodified industrial lignin shows an interesting opportunity for renewable and low cost polyols for preparation of PU.…”

Section: Introductionmentioning

confidence: 99%

Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Tavares¹,

Boas²,

Schleder³

et al. 2016

Express Polym. Lett.

118

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Abstract. Current challenges highlight the need for polymer research using renewable natural sources as a substitute for petroleum-based polymers. The use of polyols obtained from renewable sources combined with the reuse of industrial residues such as lignin is an important agent in this process. Different compositions of polyurethane-type materials were prepared by combining technical Kraft lignin (TKL) with castor oil (CO) or modified castor oil (MCO1 and MCO2) to increase their reactivity towards diphenylmethane diisocyanate (MDI). The results indicate that lignin increases the glass transition temperature, the crosslinking density and improves the ultimate stress especially for those prepared from MCO2 and 30% lignin content from 8.2 MPa (lignin free) to 23.5 MPa. Scanning electron microscopy (SEM) micrographs of rupture surface after uniaxial tensile tests show ductile-to-brittle transition. The results show the possibility to develop polyurethane-type materials, varying technical grade Kraft lignin content, which cover a wide range of mechanical properties (from large elastic/low Young modulus to brittle/high Young modulus polyurethanes).

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Section: Introductionmentioning

confidence: 99%

Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Tavares¹,

Boas²,

Schleder³

et al. 2016

Express Polym. Lett.

118

View full text Add to dashboard Cite

show abstract

“…1 The structure and molecular size of these compounds influence the polymerization. For the manufacture of polyurethane polymers, two bifunctional groups are needed as the reactants.…”

Section: Introductionmentioning

confidence: 99%

Modeling reaction kinetics of rigid polyurethane foaming process

Zhao

Gordon

Tekeei

et al. 2013

J of Applied Polymer Sci

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A theoretical model was developed to simulate the polyurethane foaming process for a rigid foam. In the model, multiple ordinary differential equations were solved by MATLAB and the model was able to predict temperature profiles by inputting foam recipe information. This initial study on foam modeling focusses on reaction kinetic parameters that were fitted to experimental temperature data as a function of time. The modeling was able to accurately model temperature profiles of single-polyol polyurethane formulations and was able to accurately predict temperature profiles of mixtures based on pure component kinetic parameters. A primary goal of this work is to expedite the ability to develop new foam formulations by simulation-especially for incorporation of new bio-based polyols into formulations.

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“…It has been extensively reported by many researchers that FT-IR technique is an effective method to characterize the hydrogen bonding in polyurethane [30][31]. The FT-IR spectra of LPU, LPUSi and LPUSiT are shown in Figure 3.…”

Section: Hydrogen-bonding Interactions In Lpumentioning

confidence: 99%

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

Wang¹,

Mou²,

Ni³

et al. 2013

Express Polym. Lett.

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Abstract.A series of novel acetic acid lignin-containing polyurethane (LPU) films coupled with aminopropyltriethoxy silane (APTS) (LPUSi) or the mixture of APTS and trimethylol propane (TMP) (LPUSiT) were prepared. With 2% APTS addition, the crosslinking density increased, and the resultant films were endowed with good mechanical properties and water resistance. It was also found that the hydrogen bonding interaction between -NH and -C=O of urethane was destroyed, and new hydrogen bonds between APTS and LPU were formed. However, when APTS content was greater than 4%, significant phase aggregation were detected, resulting in poor mechanical properties and water resistance. In contrast, the crosslinking density, tensile strength and water resistance can be further improved with TMP addition at 2% APTS. The simultaneous addition of APTS and TMP was beneficial for phase mixing and the formation of uniform network. And the surface morphology of LPUSiT films became smoother and more homogeneous.

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Crosslinking kinetics of the formation of lignin‐aminated polyol‐based polyurethane foam

Cited by 40 publications

References 15 publications

Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Modeling reaction kinetics of rigid polyurethane foaming process

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

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